Photo: Kolin Smith
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Press the stone into place, wiggling it in tight to create a vacuum behind it. Each riser veneer should be flush with the top of a stair. Be quick with your trowel to keep oozing mortar from staining the stone's face. Once the stone is set, leave it alone; disrupting it could break the vacuum, forcing you to start over. Working from left to right, install the riser stones with their faces relatively flush, using a thicker layer of mortar for thinner stones.
































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